Paternal relationship is confirmed through Y-chromosome DNA testing. Tracy Garrison and James Garrison match on 65 out of 67 markers (see YSearch IDs 6YRTM and SQ3ZZ) thereby confirming their direct paternal lines back to their MRCA Jacob Garrison (Gerritsen De Haes). Furthermore Each of these descendants of Jacob Gerritsen have taken the Big Y DNA test at FTDNA which confirmed their Haplogroup as being R-YP3896 as are the other members of the Gerrit Jansen van Oldenburg subgroup of the Garrison DNA Project that have had advanced SNP testing.
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DNA Connections
It may be possible to confirm family relationships with David by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: